Machine for turning cross-head pins.



PATENIED N 0V."24, Isoex.

No. m55-214.

o. A, MA-THENY. I MACHINE PoR TURNING GROSS-HEAD PINS.

APPLICATION FILED PEB. 18. 1903.

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10.745,214. y PACDENTEDl NQ.V.Y24, 1903.

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MACHINE PoR TURNING GROSS HEAD PINS..

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No. '745,214 A PATENTED NOV.'24, 1903.`

l GA. MATHENY.

MACHINE FOR TURNING CROSS' HEAD PINS.-

APPLIOATION FILED FEB. 1s. 1903.

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UNITED STATES latented November 24,

PATENT Brion'.

CHARLES ARMSTRONG MATHENY, VOF HIGH SPRINGS, FLORIDA.

SPECIFICATION forming part of Letters Patent No. 745,214, dated November24, 1903.

Application led February 18, 1903. Serial No. 143,981. (No model.)

To all whom, it may concern:

Be it known that I, CHARLES ARMSTRONG MATHENY, of'High Springs, in thecounty of Alachua and State of Florida, have invented a new and usefulImprovement in Machines for Turning Cross-Head Pins, of which thefollowing is a specification.

Myinvention is in the nature of a novel construction of machine forturning the pins 0f cross-heads for steam and other engines. Thecross-head pin which receives the pitman is ordinarily formed integralwith the yoke portion of the cross-head and is connected to it betweenits jaws er branches at both its ends. This makes it difficult andinconvenient to turn said pins to a true cylinder. My invention isdesigned to accomplish this work in a convenient, accurate, andpractical way; and

to vthat end it consists in the novel construcl Figure lis a frontelevation; Fig. 2, a side elevation; Fig. 3, a plan View; Fig. 4, avertical section on line 4 4 of Fig. 1; Fig'. 5, a detail; Fig. 6, afront view of a modification,

and Fig. 7 a detail relating thereto.

In general construction Iny invention comprises an annular orvring-shaped turninghead, whichis made in sections and put togetheraround the cross-head pin and is pro'- vided with cutting-bits and meansfor rotating said head and bits and for feeding the saine and also thecross-head as the work progresses.

In the drawings, G G represent the two parallel branches of thecross-head, and D is the cross-head pin, which occupies a positionbetween the two branches or jaws andl is formed in one piece with thesame. It is this pin D and the inner sides of the cross-head jaws whichare to be turn-ed and planed true by my machine. The cross-head isblocked up to a proper position by strips N N, Fig. 1, on top of twobed-plates L L and is firmly held to the same by headed bolts a a, withnuts a a', clamp-plates d2 0.2, and upright detachable bars c3 a3. Thebolts have their heads retained in undercut grooves of the bed-plates.The upright bars o3 are placed between the outer ends of theclamp-plates o. and the tops of the bed-plates L, and when the nuts a'are screwed down the clamp-plates are made to 4pinch andhold thecross-head firmly on the bed-plates L L. These two bed-plates are thusirmly held together by the cross-head and constitute the carriage forthe cross-head.

The bed-plates L have undercut transverse grooves on their under sides(see Fig. 4) where they rest upon the parallel ways U of the main frame,and these ways have flanged edges fitting said grooves. These bed-platesforming the carriage are fed along the length of the ways by ahorizontal screw-stem J, Fig. 1, tapped through a screw-threaded lug J2on the lower side of one of the bed-plates L, and this screw swivels inone of the end framesV and is turned by a belt-pulley J, as hereinafterdescribed.v Whenthe screw is turned, it causes the carriage and thecrosshead to be moved in a direction parallel to the axis ot' thecross-head pin, so that the latter may be fed into the plane of thecutters of the turning-head to successively bring all parts ot the pininto range of the cutting action.

A is the rotating turning-head made as a ring in four sections withlap-joints and bolt ed together around the cross-head pin. yThisturning-head carries the cutting-tools and is formed on its outerperiphery with a circular series of gear-teeth, which arein mesh withand receive rotary motion from a superposed driving gear-wheel A',rigidly fixed to a main drive-shaft W above, turning in bearings i'n thetop of the two upright end frames V V.

F is the ring-shaped stead y-rest or stationary guide for theturning-head A, the turninghead being grooved circularly on the outerperiphery .to receive this vsteady-rest and turning freely in thelatter. is made i'n two semicircular sections bolted together around theturning-head and is rigidly held by a horizontal arm F above and F belowthe position of the cross-head. These arms are formed with twosemicircular sections F3 F3, bolted to the inner side of one of theupright end frames V and concentric with the steady-rest F.

This stead y-rest The cutters for turning the pin D of the i grooves g,Figs. l and 4, of the turning-head and are adjustable toward the centerof the cross-head pin. C represents one of these cutters. On theopposite side of the turninghead there is another radial dovetail groovewhich receives a cutter-head B, which on its outer face has anotherradial dovetail groove,

...(see Fig. 4,) that receives the shank of a cutter S, that has acutting action at right angles to that of the cutter C and is notdesigned to act upon the cross-head pin, but against the inner sides ofthe two branches or jaws of the cross-head. To hold this eutter-headtightly, a taper key with a screw T (see Fig. 4) is adjustably fixedbeside it. When not using this cutter-head to dress the side walls ofthe cross-head7 the cutter-head B is removed and a cutter C is placed inits groove to act upon and turn the cross-head pin D.

To feed the cutter-head B down automatically when dressing the innerside walls or jaws of the cross-head, the outer end e of the cutter-headis made inclined, its forward edge being nearer the center than its rearedge, and in the plane of this cutter-head and tapped in the upper arm Fthere is a feedscrew R. This screw has a longitudinal slot r, and aroundthe screw, above the arm F', there is a collar I, having no internalscrewthreads, but having a lug r1, that enters the slot r of the screw.This collar also has a series of upwardly-projecting teeth ft2. Thescrew R is set down to contact with the cutter-head B, and when thecutter-head revolves with the annular turning-head the outer inclinedface e of the cutter-head strikes the inner end of the screw R, and thecutter-head is forced inwardly toward the center to cause the cutter Sto cut a new track in a smaller circle on the side wall or jaw of thecross-head. This screwRis automatically fed down ateach revolution tocontinually send the cutterhead closer to the center, and for thispurpose the main driving gear-wheel A has a radial slot carrying anadjustable tappet-lug Z, that lies in the plane oi' the teeth of thecollar I, so that at each revolution of the gearwheel A the collar I isturned slightly and the lug 't' of the collar, resting in the slot ofthe screw, gives a corresponding turn to the screw at each revolution,that causes the screw to follow up the cutter-head B vand intermittentlyforce it and its cutter S toward the center. When the cutter-head B isadjusted into the dovetail groove on the other side of the turning-headA to dress the other inner face of the cross-head, said cutter-head isintermittently fed down in an automatic manner by a second feed-screw Rand collar I on the other side, (see Fig. 1,) which are carried by arigid horizontal arm M, projecting inwardly from the other end frame V.

To drive the gear-wheel A', a smaller gearwheel A2 is arranged behind itin mesh with it, (see Figs. 3 and 4,) and this wheel is iixed rigidly toa shaft A3, which derives its motion from a belt through the cone-pulleyP or from a crank Q from any suitable source of power.

In order to run the carriage L L back or forward to turn the full lengthof the crosshead pin, the pulley J, which turns the feedscrew of thecarriage, is connected (see Fig. 2) by a belt K2 to a pulley K on aswinging plate K. This plate is pivoted about the axis of pulley K andhas a curved slot and set-screw O. This plate also carries three`gear-wheels l, 2, and 3, of which l is rigidly fixed to the pulley K',and 2 and 3 turn loosely upon centers on the plate K. On the end of maindrive-shaft W there is a rigidly-attached gear-wheel W', and thisgear-wheel is adapted to mesh directly either with gearwheel 2 01'3.Gear-wheel 2 is always in mesh with gear l, as the plate K is pivotedabout the center of l. New when the gear-wheel W is in mesh with 2'thepower Vis transmitted from W' to 2 and thence to l, gear 3 then runningidle. If, however, plate K is swung over, so that 3 is in mesh with W,and 2 is out of mesh with W', then the power is transmitted from W' to 3and thence through 2 to l, and as this interposes another gearwheel inthe train the effect is to reverse the direction of revolution of thebelt and the feed of the screw.

To center and adjust the cross-head in the machine, I employ a disk Ywith a pointed centery. (See Fig. 5.) This disk is made to t theconcentric ring F2 F3 of the steadyrest. Now, assuming that thecross-head is out of the machine and is about to be inserted, the firstthing is to mark on theouter face of the cross-head jaws thecenter ofthe pin, as at x. Then the centering-disk Y is placed in the ring F3 F3,as in dotted lines in Fig. 1. Then the crosshead is lined up with itsmarked center in line with the center point y of the disk Y. Thecross-head is blocked up to this position by the strips N and is thensecured by the clamps. The four sections of the turning-ring andsteady-rest are then bolted together around the cross-head pin, and thecross-head pin will then be centered in the turning-head and the cuttingaction may begin.

In Fig. 6 I show a modification of my invention, in which it isconstructed as an attachment to a lathe. The cross-head to be turned isadjusted against an angle-plate Z2, bolted to the lathe-carriage Z2. Thesteadyrest F wit-h its arms F F2 and semicircular sections F3 F3 arebolted to the tail-stock T2 of the lathe. A driving-shaft W2 with agearwheel A is adjusted to the lathe-centers c c, and a yoke-clamp O2(see Fig. 7) fits over the lathe-center c of the tail-stock and connectswith and braces the steady-rest arm F'. The cross-head G is fed throughthe turning-head in a direction parallel to the axis of the shaft W2 bythe regular back-and-forth feed of the lathe; but the steady-rest,turning-head,and automatic screw-feed and other features are IOO thesame as those already described with reference to Figs. 1, 2, 3, and 4.

- I am aware that a ring-shaped sectional turning-head withinwardly-projecting cutters and gear-teeth on its outer periphery is notbroadly new for turning wrist-pins, dac., and I make no claim to them.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, isy l. In a machine of the kind described, thecombination with the ring-shaped turninghead; of a radially-adjustablecutterhead having an outer inclined end, a feed-screw arranged to actupon said inclined end of the cutter-head with a cam action as thecutterhead revolves, a stationarysupport for the feed-screw, and meansfor imparting an advancing motion to said feed-screw substantially asshown and described.

2. In amachine of the kind described, the combination with thering-shaped turninghead; of a radially-adjustable cutter-head carried bythe turning-head and having an inclined outerend,alongitudinally-slotted feedscrew arranged to act upon the inclineof the cutter-head as it revolves, a stationary support for saidfeed-screw, an unthreaded collar with tappet-teeth arranged on thefeedscrew and having a lug entering the slot of the screw, a su perposeddrive-shaft carrying a tappet-lug adapted to strike the tappetteeth ofthe collar and feed down the screw with an intermittent but automaticaction substantially as described.

3. In a machine of the kind described, asectional ring-shapedturning-head with cutters and peripheral driving-teeth, a ring-shapedsteady-rest encircling and guiding the turning-head and made in sectionsas described, an upper and lower horizontal arm connecting thesteady-rest to the main frame, a carriage for the work located betweenthe said upper and lower arms, and means for feeding said carriagesubstantially as described.

4. In a machine of the kind described, a sectional ring-shapedturning-head with cutters and peripheral driving-teeth, a ring-shapedsteady-rest encircling and guiding the turning-'head and made insections as described, an upper and lower horizontal arm connecting thesteady-rest to the main frame, a carriage for the work located betweenthe said upperand lower arms and consisting of two undercut bed-plateswith headed bolts,clamp plates, and upright bars, horizontal ways forthe bed-plate, and a feed-'screw for the carriage substantially as shownand described.

5. In a machine of the kind described, a ring-shaped turning head, aringshaped steady-rest made in sections and embracing the turning-head,upper and lower horizontal arms supporting the steady-rest, a circularend frame for these arms arranged concentric to the steady-rest andturning-head, and a detachable center fitting in the said circular endframe'to facilitate the fitting of the work to the axial center forturning substantially as described.

6. Ina machine of the kind described, the combination of Afiring-shapedturning-head bearing cutters and peripheral teeth, a su perposeddriving-shaft with gear-Wheel meshing with the turning-head and anothergear at the end of the shaft, a carriage for holding the work in theturning-head havinga feed-screw with a pulley at its end, adriving-belt, and a swinging and adjustable plate K bearing gears 1, 2,3 adapted to receive power from the end gear of the driving-shaft formoving the carriage back and forth as may be desired substantially asset forth.

CHARLES ARMSTRONG MATHENY..

Witnesses:

JOHN ODoNALD, WALTER F. EATON.

